A preliminary study of phototransferred thermoluminescence of alexandrite

This study reports the phototransferred thermoluminescence (PTTL) of alexandrite. PTTL was induced by 470 nm illumination of samples beta irradiated to 150 Gy. The glow curve of its conventional TL shows five peaks, labelled as I-V. PTTL is observed at peaks I-IV. Time-response profiles of PTTL were analyzed as systems of an acceptor and donors with the number of donors determined by the preheating temperature. The attendant effect of thermal assistance and thermal quenching associated with the optically stimulated luminescence emitted during illumination of sample are reported and analyzed.